PR: Fix showing update status bar widget in our apps at startup and other fixes to the update process (Application)

[ccordoba12]

Description of Changes

• This is a follow up of PR: Fix visibility of status bar widget that checks for Spyder updates (Application) #21851, which fixed the widget issue for our Linux experimental installer but broke things for our Windows and Mac apps.
• Don't show generic errors while checking for updates to users because we can't give proper feedback to them on how to address the error. They'd only see a long and probably incomprehensible traceback, which wouldn't be really useful.
• Always emit the sig_ready signal after a check was performed so that the Check for updates action in the Help menu is enabled again (it's disabled while doing the check and it depends on sig_ready to be enabled after the check ends).

Issue(s) Resolved

Fixes #21861.

Affirmation

By submitting this Pull Request or typing my (user)name below,
I affirm the Developer Certificate of Origin
with respect to all commits and content included in this PR,
and understand I am releasing the same under Spyder's MIT (Expat) license.

I certify the above statement is true and correct: @ccordoba12

[dalthviz]

Checking locally the installer generated by this PR on Windows, I noticed that although now the status bar widget is visible, while doing the check for updates it showing the current Spyder version instead of the Checking for updates status. So the status bar is not going from Checking for updates to Update available but from 5.5.2rc1 to Update available when launching Spyder:

Edit: Seems like the same happens with the macOS installer

[ccordoba12]

So the status bar is not going from Checking for updates to Update available but from 5.5.2rc1 to Update available when launching Spyder:

As I mentioned in the OP, the problem is that we actually check for updates one minute after Spyder starts. So, during that time the Check for updates message and (especially) the spinner would be visible to users.

But if you think we should keep that behavior, then I can fix it here.

[dalthviz]

As I mentioned in the OP, the problem is that we actually check for updates one minute after Spyder starts. So, during that time the Check for updates message and (especially) the spinner would be visible to users.

But if you think we should keep that behavior, then I can fix it here.

I guess then status bar should show something like:

• 5.5.2rc1 -> Checking for updates -> Update available

or

• 5.5.2rc1 -> Checking for updates -> 5.5.2rc1

then?

Anyhow, indeed I think the previous behavior was better (at least more consistent than the current state of this PR), so please fix it here 👍

Just in case, to compare things in case someone else wants to chime in:

• How the status bar message is working with this PR as it is:

  • For the automatic check done on start up:
    • 5.5.2rc1 -> Update available
    • 5.5.2rc1
  • Manually triggered check:
    • Checking for updates -> Update available
    • Checking for updates -> 5.5.2rc1

• The previous behavior (for the automatic check done on start up and manually triggered ones):

  • Checking for updates -> Update available
  • Checking for updates -> 5.5.2rc1

[ccordoba12]

Anyhow, indeed I think the previous behavior was better (at least more consistent than the current state of this PR), so please fix it here 👍

No problem, I just pushed a commit that should fix the issue. Please check if it's working as expected.

[dalthviz]

Thanks @ccordoba12 ! Checked the generated installer on Windows and things now are working as expected 👍